A.O. Smith 110 Troubleshooting Manual - 4. Installation
Troubleshooting Guide
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4. INSTALLATION
1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the
National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural Gas,
Propane Installation Code in Canada.
2. All gas water heaters require careful and correct installation to ensure safe and efficient
operation. This manual must be followed exactly. Read the “Safety Guidelines” section in the
installation manual.
3. The manifold gas pressure is preset at the factory.It is computer controlled and should not
need adjustment.
4. Maintain proper space for servicing.Install the unit so that it can be connected or removed
easily. Refer to the Clearances Section on p. 8 in the installation manual for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustible air
will be available to it at all times without obstructions.
6. The electrical connection requires a means of disconnection, to terminate power to the water
heater for servicing and safety purposes.
7. Do not install the unit where the exhaust vent is pointing into any opening in a building or where
the noise may disturb your neighbors. Make sure the vent termination meets the required
distance by local code from any doorway or opening to prevent exhaust from entering a
building.
8. Particles from flour, aerosols, and other contaminants may clog the air vent or reduce the
functions of the rotating fan and cause improper burning of the gas. Regularly ensure that the
area around the unit is dust‐ or debris‐free; regular maintenance is recommended for these
types of environment.
9. If you will be installing the water heater in a contaminated area with a high level of dust, sand,
flour, aerosols or other contaminants/chemicals, they can become airborne and enter and build
up within the fan and burner causing damage to the water heater.
10. For the Indoor 110 (T‐KJr2‐IN), 310 (T‐K4‐IN), and 510 (T‐D2‐IN) models:
• These units may be converted to a direct‐vent (sealed combustion) appliance by installing a
direct‐vent conversion kit (Part No. 9007667005) which will bring in all required
combustible air from outside the building. When installing the conversion kit, please follow
all instructions included with the kit.
• If the water heater is used as a direct‐vent appliance, the unit requires a 3” intake air pipe.
The intake pipe must be sealed airtight. Air supply pipe can be made of ABS, PVC,
galvanized steel, corrugated aluminum, corrugated stainless steel or Category III stainless
steel.
• Terminating the venting through a sidewall is recommended for the direct‐vent system.
• Running the exhaust vent and the intake pipe parallel is recommended.
• Terminating the exhaust and intake on the same wall / surface is recommended.
Terminating in the same pressure zone allows for pressure balancing, which prevents
nuisance shutdowns. Follow venting clearance guidelines in the installation manual.
11. For Outdoor 110 (T‐KJr2‐OS), 310 (T‐K4‐OS), & 510 (T‐D2‐OS):
• To be installed outdoors and only in areas with mild, temperate climates.